Is it possible for an untrained person like myself to distinguish sex by observation, or am I just seeing dominant hens? I kept telling my family I wouldn't know the sex until they were over 4 weeks, because these are not sex links, but I feel like I know already. I have one RIR, and four RIRxBO. It seems to me that the three with a dark spot on their head are probably males, although I heard this was not a reliable method of sexing. When I put my hand in the tub the two largest, fluffiest chicks--who have the darkest spots on their heads--charge my hand and peck at it. The two without spots are the only ones who are calm when I pick them up, and they are smaller, and their feet feel more delicate. (Maybe just because they don't struggle). There is one with a lighter spot that seems more calm, so I don't have as strong of opinion on him, I just assume the spot means he is a he. Am I reading too much into pecking order, or do they already have rooster instincts at four days old?